Meet the man who ate only expired food for a week

Expiration dates on food sometimes arrive while the food is still edible, and almost 40 percent of perfectly good food in the U.S. goes to waste. To draw attention to the issue, Huffington Post writer Casey Williams ate only expired food for a week to see if it would impact his health. He fills Kathie Lee and Hoda in on what happened and NBC news medical contributor Dr. Natalie Azar explains what’s really safe and unsafe to eat. (Run time: 4:39)